The incident you linked where the police officer sustained life threatening injuries (they didn’t die, as far as I can tell) seems to have been a collision between two cars caused by dangerous driving, so it’s not really a relevant example.
The cited articles include charges of murder, highlighting that point.
1) It is utterly ludicrous considered in itself, going beyond even what MAGA’s lunatic fringe has dared to suggest.
2) It undermines the only possible legal defense the officer might theoretically have had (self defense).
3) Even waiving the outrageous absurdity of what you’re saying and your various insults to the reader’s intelligence, shooting the driver just means that the car is almost certain to crash into something (as indeed happened here), which creates more danger to the general public, not less.